Explosives detection by using 8-microcantilever chips with self-heating elements modified with exchanged BEA type zeolites

Pellejero, Ismael; Peralta, Ángela Millera; Urbiztondo, M.A.; Sesé, J.; Pina, M.P.; Santamarı́a, Jesús

doi:10.1109/transducers.2013.6626752

Cited by 4 publications

(9 citation statements)

References 10 publications

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“…It is worthwhile to remark that the sensing performance of the prepared titanosilicates is comparable to the already reported for Co exchanged BEA zeolites [8,9] under similar conditions.…”

Section: Resultssupporting

confidence: 82%

“…As it was expected, the recovery response for the cantilevers with higher affinity towards the target analyte after N 2 flushing is less pronounced. This observation agrees with the thermodynamic sorption heat involved [8] and underlines the degassing requirements for a reusable, reliable explosive detector sensor.…”

Section: Gas Sensing Measurementssupporting

confidence: 86%

“…The micromechanical structures presented were fabricated from n-type SOI (silicon on insulator) wafers by using standard optical lithography and bulk micromachining technologies with five-levels of masks [8]. Cantilevers are 200 μm wide, 15 μm thick and from 500 to 535 μm in length.…”

Section: A Microfabrication Of Si Cantileversmentioning

confidence: 99%

“…The main features of the so obtained powders for coating of the cantilevers are included in Table II. [4,5,8,9]. In order to control the location of the ETS-10 crystals on the Si transducer, a rapid solvent evaporation is induced during the deposition procedure thanks to the meander type resistors printed on the cantilever tip.…”

Section: A Microfabrication Of Si Cantileversmentioning

confidence: 99%

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Explosives Detection by array of Si μ-cantilevers coated with titanosilicate type nanoporous materials

Pina

Almazan

Eguizábal

et al. 2014

IEEE SENSORS 2014 Proceedings

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An array comprising 4 Si microcantilevers coated with nanoporous ETS-10 crystals sub-micrometric in size has been deployed as a multisensing platform for 2-nitrotoluene (an explosive related molecule) recognition. For such purposes, the adsorption properties of synthetic microporous ETS-10 titanosilicate type materials have been tailored by means of the Si/Ti ratio, and surface grafting with organic groups (amine, imidazol). Our general strategy for vapor detection of explosives involves the combination of Si based nanoporous solids as sensing materials and resonating Si cantilevers provided with self-heating elements as tiny microbalances (mass sensitivity factors ~18 Hz/ng). Particularly for this work, ETS-10 type titanosilicates with promoted basic properties (Si/Ti=4, -NH 2 anchored on the external surface) exhibit the higher affinity towards nitroaromatic derivatives as electron defficient molecules. A high remarkable hydrophilic character is shown by titanosilicates modified by covalent linkage with imidazole based organosilane (above 17% wt. water uptake at room temperature). Accounting from such versatile sorption behavior, the family of nanoporous ETS-10 crystals has been deployed by microdropping technique over the 8 Si-microcantilevers chip. By means of a portable lowpower electronic interface capable of the simultaneous excitation and measurement of 4 sensor output signals, such multisensing platform has been successfully applied for 2-nitrotoluene detection at trace level.

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“…It is worthwhile to remark that the sensing performance of the prepared titanosilicates is comparable to the already reported for Co exchanged BEA zeolites [8,9] under similar conditions.…”

Section: Resultssupporting

confidence: 82%

Section: Gas Sensing Measurementssupporting

confidence: 86%

Section: A Microfabrication Of Si Cantileversmentioning

confidence: 99%

Section: A Microfabrication Of Si Cantileversmentioning

confidence: 99%

See 2 more Smart Citations

Explosives Detection by array of Si μ-cantilevers coated with titanosilicate type nanoporous materials

Pina

Almazan

Eguizábal

et al. 2014

IEEE SENSORS 2014 Proceedings

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“…Our general strategy involves the combination of: i) Si based nanoporous solids as sensing materials; and, ii) resonating Si microcantilevers provided with self-heating elements working as tiny microbalances (mass sensitivity factors ~18 Hz/ng). Thus, the progress achieved in the field of cantilever-based sensors [2,3,4,5,6] is combined in a synergic way with the molecular recognition and sorption properties of nanoporous solids [7] on the same platform. In view of the already reported sorption properties of Co-BEA zeolites towards nitroderivates [3,4,6]; this work proposes the study of a multisensing platform comprising 4 identical Si microcantilever like sensors coated with cobalt exchanged BEA type zeolite (Si/Al=12.5; Co/Al=0.78) for the reproducible and reliable detection of 2-nitrotoluene (o-MNT).…”

Section: Introductionmentioning

confidence: 99%

Portable lock-in amplifier for microcantilever based sensor array. Application to explosives detection using Co-BEA type zeolites as sensing materials

García-Romeo

Calvo

Medrano

et al. 2014

IEEE SENSORS 2014 Proceedings

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Recent advances in microcantilever-based sensors have led to a significant increase in sensitivity, making them a competitive solution in highly demanding applications as explosives detection. However, these sensors face severe challenges related to: reliability, sensitivity, reproducibility and throughput; that have yet to be solved for commercial applications. This paper describes our efforts in this direction, particularly on the reproducible detection of nitroaromatic type explosives by means of parallelization combined with: i) nanoporous solids as sensing materials; and, ii) a portable lowpower electronic readout interface capable of both excitation and measurement of the multisensing platform. The response of the sensor array, comprising 4 microcantilevers, due to presence of 2-nitrotoluene, a common explosive taggant, has been properly monitored. The obtained results with 4 identical Co-BEA coated Si microcantilevers underline the importance of a proper sensing material degassing on the sensor performance.

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Explosives Detection by Array of Si $\mu $ -Cantilevers Coated With Titanosilicate-Type Nanoporous Materials

et al. 2016

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Explosives detection by using 8-microcantilever chips with self-heating elements modified with exchanged BEA type zeolites

Cited by 4 publications

References 10 publications

Explosives Detection by array of Si μ-cantilevers coated with titanosilicate type nanoporous materials

Explosives Detection by array of Si μ-cantilevers coated with titanosilicate type nanoporous materials

Portable lock-in amplifier for microcantilever based sensor array. Application to explosives detection using Co-BEA type zeolites as sensing materials

Explosives Detection by Array of Si $\mu $ -Cantilevers Coated With Titanosilicate-Type Nanoporous Materials

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Explosives detection by using 8-microcantilever chips with self-heating elements modified with exchanged BEA type zeolites

Cited by 4 publications

References 10 publications

Explosives Detection by array of Si &#x03BC;-cantilevers coated with titanosilicate type nanoporous materials

Explosives Detection by array of Si &#x03BC;-cantilevers coated with titanosilicate type nanoporous materials

Portable lock-in amplifier for microcantilever based sensor array. Application to explosives detection using Co-BEA type zeolites as sensing materials

Explosives Detection by Array of Si $\mu $ -Cantilevers Coated With Titanosilicate-Type Nanoporous Materials

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Explosives Detection by array of Si μ-cantilevers coated with titanosilicate type nanoporous materials

Explosives Detection by array of Si μ-cantilevers coated with titanosilicate type nanoporous materials